Granted Patent
Utility
US 4,042,092 · App. 05/599,718
Duplicating method
Inventor:
Douglas A. Newman
Patented Case
View Patent ↗
Granted: Aug 16, 1977
Filed: Jul 28, 1975
Inventor
Douglas A. Newman
Assignee (at issue)
Columbia Ribbon and Manufacturing Co., Inc.
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.